88 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 4937. In Kagoshima Gulf, Japan. Bott. temp, G4.8°. 58 fathoms. 

 M. lav. p. 



Bathymetrical range, 40-59 fathoms. Extremes of temperature, 64.8°- 

 64.9°. Five specimens. 



Coelopleurus floridanus A. Ag. 



Coelopleurus floridanus A. Agassiz, 1872. Rev. Ech., Pt. I, p. 102. 



Plates 44, figs, i, 2; 49, figs. 31-33; 53, fig. 11. 



This species was not taken by the " Albatross," but is included for 

 comparison with the other species of the genus. 



Doderlein (1906, PI. 45, fig. 2) has given a series of figures illustrating 

 the pedicellariae and calcareous particles of floridanus, but as his specimen 

 came from southeast of the Cape of Good Hope, and is quite possibly not 

 this species, it seems desirable to give a few figures of pedicellarise from 

 a topical West Indian specimen. 



The tridentate pedicellariue are common, and show a remarkable diversity 

 of size and form. The valves measure from .35 to 2.30 mm. in length, and 

 are commonly rosy-red in color, at least along the mid-line. They may 

 be very slender (PI. 49, fig. 32) or somewhat widened, with a constriction 

 near the middle (PI. 49, fig. 33). The latter are small, and approach tri- 

 phyllous pedicellariaB in their general appearance, but intergrade completely 

 with the larger ones. The stalks of the tridentate pedicellariae are com- 

 monly several times as long as the head, but in the large ones the heads 

 may equal or even exceed the stalk. The upper end of the stalk is slightly 

 enlarged and rounded, as in inaculatus. 



Tlie ophicephalous pedicellarios are very common, especially on the 

 actinal surface. The heads and even the upper end of the stalks are 

 strongly tinged (in the lime itself) with red, but the larger the pedicelhiria 

 the paler is the color. The valves (PI. 49, fig. 31) are somewhat elongate, 

 and are markedly constricted at the middle. They measure about half a 

 millimeter m length, while the stalk is four or five times as long. The 

 upper end of the stalk is flat and expanded, as in macula/us. 



Triphyllous pedicellariae appear to be wanting. 



The calcareous i)articles of the pedicels are rough, curved irregular rods 

 like those of inanihtin^, and the perforated plates from the gills cannot be 

 distinguished from those of that species. 



